package edu.hit.hitmall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import edu.hit.common.utils.PageUtils;
import edu.hit.common.utils.Query;

import edu.hit.hitmall.product.dao.CategoryDao;
import edu.hit.hitmall.product.entity.CategoryEntity;
import edu.hit.hitmall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {

        List<CategoryEntity> categories = baseMapper.selectList(null);

        List<CategoryEntity> level1Menu = categories.stream().filter(category ->
                category.getParentCid() == 0
        ).map(menu -> {
            menu.setChildren(getChildren(menu, categories));
            return menu;
        }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort())))
                .collect(Collectors.toList());

        return level1Menu;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前删除的菜单是否被别处引用
        baseMapper.deleteBatchIds(asList);
    }


    private List<CategoryEntity> getChildren(CategoryEntity category, List<CategoryEntity> all) {
        return all.stream().filter(menu -> menu.getParentCid() == category.getCatId())
                .map(menu -> {
                    menu.setChildren(getChildren(menu, all));
                    return menu;
                }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort())))
                .collect(Collectors.toList());
    }

}